how many chromosomes do humans have cell

Types of Cell Division - Cell division is a method by which new cells are originated from pre-existing cells. The formation of daughter amoebae in amoeba, the development of sex cells and the growth of a young animal or plant into an adult, all invo..

>Mitosis occurs in all the living cells of the body of an organism. Hence it is called somatic cell division. Mitosis is described as equational division since the chromosome number of daughter cells will be same as that of the parent cell. Mitosis ..

Prokaryotic and Eukaryotic Cells - The structure of the cell that we have studied so far is that of a Eukaryotic cell. How is a Prokaryotic cell different from a Eukaryotic cell? The main difference between these two cell types i..

The simplest structural units into which a complex multicellular organism can be divided and still retain the functional characteristic of life, are called cells. One of the unifying generalisations of biology is that certain fundamental activities are common to almost all cells..

The structure of the cell that we have studied so far is that of a eukaryotic cell. How is a prokaryotic cell different from a eukaryotic cell? The main difference between these two cell types is that prokaryotic cells do not hav..

Why are Organisms Composed of Cells? - All living organisms are composed of structural and functional units called cells. The body of a living organism may be composed of a single cell - as in unicellular organisms or many cells - as in multicellular organism..

It is a metabolic disorder characterised by a decreased oxygen transport in the blood. The decrease is due to the presence of a defective haemoglobin (HbS) in place of the normal haemoglobin (Hb). HbS has a very low affinity for oxygen. As a result, there is a decrease in the blood supply to vital..

In bacteria, which being prokaryotic organisms, the entire hereditary material is packed into a single, irregularly folded compact mass called nucleoid or genophore or bacterial chromosome. It is short and simple consisting of a single DNA molecule. The DNA is in the form of a doubl..

Let us think of a pair of contrasting character represented by the alleles R and r. A pair of homologous chromosomes carrying these alleles undergo pairing in prophase I and subsequently separate (or segregate) during anaphase I of first meiosis. In anaphase II of second meiosis, the chro..

It has been noted that in the dihybrid genetic crosses, a recombination frequency of less than 50% indicates linkage of the two genes involved. Morgan and Sturtevant found that the recombination frequency varies for different mutant gene pairs. The difference in the recombination frequency wa..